Jasmine rolls a number cube 72 times. The number 2 is rolled 13 times and the number 3is rolled nine times To the nearest whole percent, what is the experimental probability of rolling a 2or 3

Do one of the following, as appropriate: (a) find the critical value z subscript alpha divided by 2 , (b) find the critical value t subscript alpha divided by 2 . 99%; nequals 17; sigma is unknown; population appears to be normally distributed.